/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2007 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *	notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *	notice, this list of conditions and the following disclaimer in the
 *	documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *	contributors may be used to endorse or promote products derived from
 *	this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.objectweb.asm.tree;

import java.util.ArrayList;
import java.util.List;

import org.objectweb.asm.AnnotationVisitor;

/**
 * A node that represents an annotationn.
 * 
 * @author Eric Bruneton
 */
public class AnnotationNode implements AnnotationVisitor {

	/**
	 * The class descriptor of the annotation class.
	 */
	public String desc;
	/**
	 * The name value pairs of this annotation. Each name value pair is stored
	 * as two consecutive elements in the list. The name is a {@link String},
	 * and the value may be a {@link Byte}, {@link Boolean}, {@link Character},
	 * {@link Short}, {@link Integer}, {@link Long}, {@link Float},
	 * {@link Double}, {@link String} or {@link org.objectweb.asm.Type}, or an
	 * two elements String array (for enumeration values), a
	 * {@link AnnotationNode}, or a {@link List} of values of one of the
	 * preceding types. The list may be <tt>null</tt> if there is no name
	 * value pair.
	 */
	public List<Object> values;

	/**
	 * Constructs a new {@link AnnotationNode}.
	 * 
	 * @param desc the class descriptor of the annotation class.
	 */
	public AnnotationNode(final String desc) {
		this.desc = desc;
	}

	/**
	 * Constructs a new {@link AnnotationNode} to visit an array value.
	 * 
	 * @param values where the visited values must be stored.
	 */
	AnnotationNode(final List<Object> values) {
		this.values = values;
	}

	// ------------------------------------------------------------------------
	// Implementation of the AnnotationVisitor interface
	// ------------------------------------------------------------------------
	public void visit(final String name, final Object value) {
		if (values == null) {
			values = new ArrayList<Object>(this.desc != null ? 2 : 1);
		}
		if (this.desc != null) {
			values.add(name);
		}
		values.add(value);
	}

	public void visitEnum(
			final String name,
			final String desc,
			final String value) {
		if (values == null) {
			values = new ArrayList<Object>(this.desc != null ? 2 : 1);
		}
		if (this.desc != null) {
			values.add(name);
		}
		values.add(new String[]{desc, value});
	}

	public AnnotationVisitor visitAnnotation(
			final String name,
			final String desc) {
		if (values == null) {
			values = new ArrayList<Object>(this.desc != null ? 2 : 1);
		}
		if (this.desc != null) {
			values.add(name);
		}
		AnnotationNode annotation = new AnnotationNode(desc);
		values.add(annotation);
		return annotation;
	}

	public AnnotationVisitor visitArray(final String name) {
		if (values == null) {
			values = new ArrayList<Object>(this.desc != null ? 2 : 1);
		}
		if (this.desc != null) {
			values.add(name);
		}
		List<Object> array = new ArrayList<Object>();
		values.add(array);
		return new AnnotationNode(array);
	}

	public void visitEnd() {
	}

	// ------------------------------------------------------------------------
	// Accept methods
	// ------------------------------------------------------------------------
	/**
	 * Makes the given visitor visit this annotation.
	 * 
	 * @param av an annotation visitor. Maybe <tt>null</tt>.
	 */
	public void accept(final AnnotationVisitor av) {
		if (av != null) {
			if (values != null) {
				for (int i = 0; i < values.size(); i += 2) {
					String name = (String) values.get(i);
					Object value = values.get(i + 1);
					accept(av, name, value);
				}
			}
			av.visitEnd();
		}
	}

	/**
	 * Makes the given visitor visit a given annotation value.
	 * 
	 * @param av an annotation visitor. Maybe <tt>null</tt>.
	 * @param name the value name.
	 * @param value the actual value.
	 */
	static void accept(
			final AnnotationVisitor av,
			final String name,
			final Object value) {
		if (av != null) {
			if (value instanceof String[]) {
				String[] typeconst = (String[]) value;
				av.visitEnum(name, typeconst[0], typeconst[1]);
			} else if (value instanceof AnnotationNode) {
				AnnotationNode an = (AnnotationNode) value;
				an.accept(av.visitAnnotation(name, an.desc));
			} else if (value instanceof List) {
				AnnotationVisitor v = av.visitArray(name);
				List<?> array = (List<?>) value;
				for (int j = 0; j < array.size(); ++j) {
					accept(v, null, array.get(j));
				}
				v.visitEnd();
			} else {
				av.visit(name, value);
			}
		}
	}
}
